PSLEAt first, Leah had a total of 114 blue and red balloons. 11 red balloons burst. She then increased the number of blue balloons by 90%. After that, Leah had a total of 175 balloons. How many red balloons did she have at first?
|
Blue |
Red |
Total |
Before |
10 u |
|
114 |
Change |
+ 9 u |
- 11 |
+ 61 |
After |
19 u |
|
175 |
90100 =
910Increase in the number of balloons
= 175 - 114
= 61
9 u = 61 + 11
9 u = 72
1 u = 72 ÷ 9 = 8
Number of blue balloons at first
= 10 u
= 10 x 8
= 80
Number of red balloons at first
= 114 - 80
= 34
Answer(s): 34